Louver



July 6 MacDoUGALD DEXTER LOUVER Filed Oct.

m.. l .Brill/Siriugnveulor /l/nc. Dfxrfe.

each door-by providing one orme-re arms 14, which, inFig.Y 1,"eXtends upwardly into the space under the, dome and carries a Ycounterweight 15r which would tend to Vcorun-A Ytersbalan'ce the weight ofthe door 8.Y Inas'- much asthe length oit the llinks is calculated e to set the'doors approximately in half opeiiV position when not exposed tog'wind pressure,

Y it" follows that both counter-weights will overhang slightly towards .the Y center4 ofxthe 'louveix f'As the windwa-idlouver doorjis Jforced inwardly the leverage of itsIcounter-f Ybalance decreases',while the leverageoi the counter-balance'of the leedoor increasesas.v

the latter opens. fTh-e result is that the increasingleverageoi'the lee* door itself as it swings outwardly is substantially 'neutral-1 izedV sothat the Windward door isY lett` quite 'sensitive' gto wind pressureY and-therefore adapted to closel fti-glitly under fmoderate winds, Jwhich is .desirable topievent rain blowing in under the doors.

I In. the:constructionvsnown in Fig.'2,V in

order to obtain Va Hatter dome 5, which may. be'desirable under certain: architectural conditions, I mount'tlie counterweights 15a on yarmis14ar which project outwardly beyond y Y and above the side edges of the dome, and for this purpose are provided vwith an vangled Vportion `16 which sufficiently offsets the`upper portion oit' the arm to clear'the over# rhang of the dome eaves.. In Fig. 1, I have shown the counterweight 5 asfan individual Weight on each arm 14 of Va door, but in Fig; 2,1 have ,shown the 'counterweight la's formed by. a rod which extends the length-L Y of the louver and -is-'eonnected to several* arms 14a of the same side'of the louver.

The side wallsof the louvers areprovided with'ilashing flanges y17 at their vleases which serve to connect them to the roof. .u

In' operation, havingV vconstructed 1 and and mounted. the -louver in the manner described, upon releasing the fiexibleconneci tion 12' the lo-uver linkswill drop down to operating position, Ysetting the louver doors in :normal operatingfposition. ','Ifthe links are of light material it maybedesirable to attach Va pull cord 185 to one-of them at Vor :near the jointso'fth'atthey can be I pulled down to operating position. Under such conditions the ventilation takes place equally y under Veach door asthe op'eningsQ are equally open.' lli/Then any lateral'windpressureoccurs thedoor Von the Windward side will tend Vto closerandthrough Vthe links-Vcorrespond;`

ingly toswing the other door wideropep,

`AsYtheWindward door swings closedV itsl respective counterweights move in a feontraify4 direction and their leverage decreasesY so that the resistance ofthe rWindward door, graduwind increases.

counterweights. y'It v thus c follows that rela-V tively light wind pressure VwillV close e the' "ally decreases as its exposed'VV areal` to the` Y On the contrary 'asthe lee doorV opens its increasing leverage is counter? balanced by the .increasingV leverage of itsf windward doors and fully open the lee-doors. A

Having thus described'myinventiomwhat f I claim as new and desire tosecurebyu-Let-V ters Patent, is': l l e l vA louver having oppositev pivoted vanes, a link hinged to each vane, a 'pivot connecting the adjacent ends of said links, means to hold said links with their pivot .below dead center position, said means comprising a positive stopfon they links, and anoverhead flexible i connectionV adapted to, break said pivot joint and draw the louvervanes closed. Irl-testimony whereof I aiiix my signature.

MACDOGLD DEXTER.l 

